Freya Halloran — iOS Engineer
Manchester
iOS engineer with seven years in Swift, five of them on regulated banking apps. Rewrote a payments journey so it passed a full external accessibility audit, lifting the store rating from 3.4 to 4.6 over two releases. Returned from an eleven-month parental break in 2023 and now owns that journey end to end.
Experience
iOS Engineer, Quillon Bank · May 2023 – present
Payments and card controls in an app with 1.4 million monthly users.
- Rewrote the payments journey in SwiftUI against WCAG 2.2, clearing all 31 findings from an external audit and lifting the store rating from 3.4 to 4.6.
- Cut cold start from 2.9s to 900ms by deferring feature-flag fetches and removing 46 of the 71 objects built at launch.
- Took crash-free sessions from 99.1% to 99.87% by rebuilding the offline request queue that had been silently dropping transfers.
- Organised snapshot tests across the 24 card-control screens, which caught an iOS 17 layout break a fortnight before release.
Parental leave, Career break · June 2022 – April 2023
- Maintained an open-source Swift keychain package throughout, shipping four releases including the move to structured concurrency.
- Answered 130 issues across two Swift packages during the break, holding median first response under three days.
iOS Developer (nine-month contract), Ardwick Digital · September 2021 – May 2022
Fixed-term contract on a grocery retailer ordering app.
- Delivered the substitutions screen the retailer had descoped twice, cutting order cancellations by 23% in its first month.
- Migrated 60 view controllers from Objective-C to Swift without a feature freeze, retiring the last of a 2014 codebase.
iOS Developer, Pelham Mobile · July 2018 – August 2021
- Built the offline reading mode for a magazine app with 240,000 subscribers, taking average session length up 31%.
- Replaced hand-rolled networking with URLSession and Codable, removing 4,300 lines and a recurring class of decoding crashes.
Projects
- Keyring — An open-source Swift wrapper over the iOS keychain, with async APIs and biometric gating.
Education
- BSc Computer Science · University of Leeds · September 2015 – June 2018
Skills
- Languages: Swift, Objective-C, Kotlin, TypeScript
- Platform: SwiftUI, UIKit, Swift Concurrency, Combine, Core Data, XCTest
- Practice: Accessibility audits, Release management, Snapshot testing, Crash triage, Code review
